Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C17/00—Preparation of halogenated hydrocarbons
  • C07C17/35—Preparation of halogenated hydrocarbons by reactions not affecting the number of carbon or of halogen atoms in the reaction
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C17/00—Preparation of halogenated hydrocarbons
  • C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
  • C07C17/20—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms
  • C07C17/202—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms two or more compounds being involved in the reaction
  • C07C17/206—Preparation of halogenated hydrocarbons by replacement by halogens of halogen atoms by other halogen atoms two or more compounds being involved in the reaction the other compound being HX
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C17/00—Preparation of halogenated hydrocarbons
  • C07C17/38—Separation; Purification; Stabilisation; Use of additives
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/582—Recycling of unreacted starting or intermediate materials

Definitions

• the present invention relates to a process for preparing fluorinated organic compounds, more particularly to a process for preparing fluorinated olefins, and even more particularly to a process for producing 2,3,3,3-tetrafluoropropene (HFO-1234yf).
• HFOs hydrofluoroolefms
• tetrafluoropropenes including
• HFO-1234yf 2,3,3,3-tetrafluoropropene
• HFO-1234yf has also been shown to be a low global warming compound with low toxicity and, hence, can meet increasingly stringent requirements for refrigerants in mobile air conditioning. Accordingly, compositions containing HFO-1234yf is a leader among the materials being developed for use in many of the aforementioned applications.
• 4,900,874 (Ihara et al) describes a method of making fluorine containing olefins by contacting hydrogen gas with fluorinated alcohols. Although this appears to be a relatively high-yield process, commercial scale handling of hydrogen gas at high temperature is potentially hazardous. Also, the cost of commercially producing hydrogen gas, such as building an on-site hydrogen plant, is economically costly.
• U.S. Pat. No. 2,931,840 (Marquis) describes a method of making fluorine containing olefins by pyrolysis of methyl chloride and tetrafluoroethylene or
• chlorodifluoromethane This process is a relatively low yield process and a very large percentage of the organic starting material is converted to unwanted and/or unimportant byproducts, including a sizeable amount of carbon black which tends to deactivate the catalyst used in the process.
• the present invention relates, in part, to one or more process steps for improving the reaction efficiency used for the production of HFOs, such as 2,3,3,3- tetrafluoropropene (1234yf). [0009] In one aspect, the present invention relates to a process for preparing 2-chloro-
• 3,3,3-trifiuoropropene by providing a starting composition including at least one compound of formula I, II, and/or III
• X is independently selected from F, CI, Br, and I, provided that at least one X is not fluorine.
• Such starting composition is contacted with a fluorinating agent to produce a final composition including 2-chloro-3,3,3-trifluoropropene (1233xf), HCl, unreacted HF, optional unreacted starting compound(s), and one or more by-products.
• the by-products may include one or a combination of trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3- difluoropropene (1232xf), 2-chloro-l,l,l,2-tetrafluoropropane (244bb), 1,1,1,2,2- pentafluoropropane (245 cb), dichlorotrifluoropropane (243), trichlorodifluoropropane (242), and dimer(s) such as C 6 H 3 F 6 C1, C 6 H 3 F 7 C1 2 , C 6 F 6 C1 2 , C 6 H 8 C1 2 , C 6 F 5 C1 3 , and/or C 6 H 3 F 2 C1 5 .
• at least one of the compounds is recyclable to the contacting step.
• This final composition is then processed to separate desired products and recyclables from the remainder of the composition.
• 1233xf and HCl are first separated by feeding the composition into a recycle or distillation column. From such a column, the lighter components, such as 1233xf, 244bb (if any), 245cb (if any), HCl, and a portion of unreacted HF are isolated in a first or top stream, and the remaining components, such as unreacted HF, optional unreacted starting compounds, one or more by-products, and residual 1233xf are recovered in a second or bottom stream. From the top stream, 1233xf is purified using standard distillation methods, such as those provided herein.
• the bottom stream of the recycle or distillation column is then further processed to isolate recyclable compounds from the first reaction step. Unreacted HF, for example, is substantially separated by phase separation. More specifically, the second or bottom stream from the recycle column is provided to a phase separator where unreacted HF separates into a first layer. In certain embodiments, this first layer also includes, as a residual portion, certain of the organics such as, but not limited to, 1233xf, 1232xf, and 243. The remaining organics (e.g.
• optional unreacted starting compound, residual 1233xf, and one or more by-products are separated into a second layer.
• the HF-rich first layer is then extracted, optionally purified, and recycled.
• the second layer may be similarly extracted and the unreacted starting material (if any) and recyclable products and/or by-products purified for recycling.
• the final composition of the reaction includes each of at least 2-chloro-3,3,3-trifluoropropene (1233xf), HC1, unreacted HF, optional unreacted starting compound, trichlorofluoropropene (1231) isomers, 2,3- dichloro-3,3-difluoropropene (1232xf), a first by-product selected from the group consisting of 1,1,1,2-tetrafluoropropane (244bb), 1,1,1,2,2-pentafluoropropane (245cb), and
• dichlorotrifluoropropane (243), trichlorodifluoropropane (242), and combinations thereof, and a third by-product selected from the group consisting of C6H3F6CI, C 6 H 3 F 7 Cl 2 , C6F 6 Ci 2 , C 6 H 8 C1 2 , C6F5CI3, C6H3F 2 CI5, and combinations thereof.
• the final composition is then fed into a recycle or distillation column, where the lighter components, such as 1233xf, first by-product(s), HC1, and a portion of unreacted HF are isolated from the column in a first or top stream.
• the remaining components such as unreacted HF, optional unreacted starting compounds, residual 1233xf, trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), second by-product(s) and third by-product(s) are recovered in a second or bottom stream.
• the 1233xf is purified using standard methods, such as those described herein, and forwarded to the second stage of the reaction to produce 244bb.
• the compounds in the bottom stream may then be further separated to isolate recyclable compounds from the first reaction step.
• Unreacted HF for example, is separated by phase separation.
• the second stream from the recycle column is provided to a phase separator where the majority of unreacted HF separates into a first layer.
• this first layer also includes, as a residual portion, certain of the organics such as, but not limited to, 1233xf, 1232xf, and 243.
• the remaining organics not provided in the first layer e.g. optional unreacted starting compound, residual amounts of 1233xf, 1231 isomers, 1232xf, and second and third by-product(s)
• a small portion of unreacted HF are separated into a second layer.
• the first layer which is rich in HF, is then extracted, optionally purified, and recycled.
• the optional unreacted startmg compound, trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), second by-product(s) are separated from the third by-products by a high boiler purge system.
• the optional unreacted starting compound, trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), residual amounts of 1233xf and second by-product(s) may then be recycled to the reactor.
• Applicants have discovered that the separation of the components in the bottom stream of the first recycle column (e.g. HF, unreacted starting compound, and certain by-products) allows for easier recycle of reactants back into reactor.
• the economy of the process is also improved by purifying such recycles and removing undesirable by-products that deleteriously affect catalyst life or otherwise degrade the reactor.
• the processes of the present invention result in reduced catalyst deactivation, as a result of the recycles, and corrosion of the reactor is minimized. Additional embodiments and advantages to the present invention will be readily apparent to one of skill in the art, based on the disclosure provided herein.
• FIG. 1 provides a schematic overview of one embodiment of the process of removing 1233xf and recyclable compounds from the 1233xf product stream.
• FIG. 2 provides a schematic overview of the high boiler purge system.
• the present invention relates to a
• X is independently selected from F, CI, Br, and I, provided that at least one X is not fluorine.
• the compound(s) of Formula I, II and/or III contains at least one chlorine, a majority of the Xs as chlorine, or all Xs as chlorine.
• the compound(s) of formula I includes 1,1,2,3-tetrachloropropene (1230xa).
• the compound(s) of formula II includes 2,3,3,3-tetrachloropropene (1230xf).
• the compound(s) of formula III include 1,1,1,2,3- pentachloropropane (240db).
• the method generally includes at least three reaction steps.
• a starting composition including compounds of Formula I, II, and/or III e.g. 1,1,2,3- tetrachloropropene, 2,3,3,3-tetrachloropropene, and/or 1,1,1, 2,3 -pentachloropropane
• anhydrous HF in a first vapor phase reactor (fluorination reactor) to produce a mixture of 2-chloro-3,3,3-trifluoropropene (1233xf) and HC1.
• the reaction occurs in the vapor phase in the presence of a vapor phase catalyst, such as, but not limited to, a fluorinated chromium oxide.
• the catalyst may (or may not) have to be activated with anhydrous hydrogen fluoride HF (hydrogen fluoride gas) before use depending on the state of the catalyst.
• fluorinated chromium oxides are disclosed as the vapor phase catalyst, the present invention is not limited to this embodiment. Any fluorination catalysts known in the art may be used in this process. Suitable catalysts include, but are not limited to chromium, aluminum, cobalt, manganese, nickel and iron oxides, hydroxides, halides, oxyhalides, inorganic salts thereof and their mixtures and any one of which may be optionally fluorinated.
• Combinations of catalysts suitable for the present invention nonexclusively include Cr 2 0 3 , FeCl 3 /C, Cr 2 0 3 /Al 2 0 3 , Cr 2 0 3 /A1F 3 , Cr 2 0 3 /carbon, CoCl 2 /Cr 2 0 3 /Al 2 0 3 , NiCl 2 /Cr 2 0 3 /Al 2 0 3 , CoCl 2 /AlF 3 , NiCl 2 /AlF 3 and mixtures thereof.
• Chromium oxide/aluminum oxide catalysts are described in U.S. Pat. No. 5,155,082 which is incorporated herein by reference. Chromium (III) oxides such as crystalline chromium oxide or amorphous chromium oxide are preferred with amorphous chromium oxide being most preferred. Chromium oxide (Cr 2 0 3 ) is a commercially available material which may be purchased in a variety of particle sizes. Fluorination catalysts having a purity of at least 98% are preferred. The fluorination catalyst is present in an excess but in at least an amount sufficient to drive the reaction.
• This first step of the reaction may be conducted in any reactor suitable for a vapor phase fluorination reaction.
• the reactor is constructed from materials which are resistant to the corrosive effects of hydrogen fluoride and catalyst such as Hastalloy, Nickel, Incoloy, Inconel, Monel and fluoropolymer linings.
• inert gases such as nitrogen or argon may be employed in the reactor during operation.
• the mol ratio of HF to 1230xa in step 1 of the reaction is 1 : 1 to 50: 1, from about 10:1 to about 50:1, or from about 10:1 to about 20:1.
• the reaction between HF and 1230xa is carried out at a temperature from about 200°C to about 600°C, in certain embodiments, about 200°C to about 400°C, or about 200°C to about 300°C.
• the reaction pressure is about of about 0 psig to about 500 psig, in certain embodiments from about 20 psig to about 200 psig, or about 50 to about 100 psig.
• 1230xf in step 1 of the reaction is 1 :1 to 50:1, from about 10: 1 to about 50: 1, or from about 10:1 to about 20: 1.
• the reaction between HF and 1230xf is carried out at a temperature from about 200°C to about 600°C, in certain embodiments, about 200°C to about 400°C, or about 200°C to about 300°C.
• the reaction pressure is about of about 0 psig to about 500 psig, in certain embodiments from about 20 psig to about 200 psig, or about 50 to about 100 psig.
• 240db in step 1 of the reaction is 1 : 1 to 50:1, from about 10: 1 to about 50: 1 , or from about 10: 1 to about 20:1.
• the reaction between HF and 240db is carried out at a temperature from about 200°C to about 600°C, in certain embodiments, about 200°C to about 400°C, or about 200°C to about 300°C.
• the reaction pressure is about of about 0 psig to about 500 psig, in certain embodiments from about 20 psig to about 200 psig, or about 50 to about 100 psig.
• the fluorination reaction may be carried out to attain a single- or multi-pass conversion of at least 1% or higher, 5% or higher, 10% or higher or about 20% or higher.
• the starting reagent is converted to 1233xf in a single pass, wherein the reaction conditions achieve a conversion amount greater than 75%, greater than 85%, greater than 95% or greater than 99%.
• the resulting effluent includes small or trace amounts of unreacted starting material or may be substantially free of such compounds.
• the effluent from the fluorination reaction step including any intermediate effluents that may be present in multi-stage reactor arrangements, are processed to achieve desired degrees of separation and/or other processing.
• the effluent will generally also include HC1, unreacted HF, and trace amounts, if any, of unreacted starting component (e.g. 1230xa, 1230xf and/or 240db).
• the effluent may also include one or more by-product organics such as underfluorinated and/or overfluorinated intermediates.
• Non-limiting examples of underfluorinated intermediates include trichlorofluoropropene (1231) isomers and 2,3- dichloro-3,3-difluoropropene (1232xf), and non-limiting examples of overfluorinated intermediates include 2-chloro-l,l,l,2-tetrafluoropropane (244bb) and 1,1,1,2,2- pentafluoropropane (245cb).
• Other by-product organics may also include, but are not limited to, dichlorotrifluoropropane (243), and trichlorodifluoropropane (242) and dimers derived from one or more of the starting compounds.
• dimers derived from 1230xa include, but are not limited to, C6H 3 F 6 C1, C6H3F7CI2, C 6 F6Ci2, CeHgC ⁇ , C 6 F 5 C1 3 , C 6 H 3 F 2 C1 5 , and the like.
• the effluent may be processed in one or more steps to isolate the 1233xf, as well as certain unreacted components and/or byproducts that are useful as a recyclables.
• starting reagent 1 is provided to a drier 3 and then to the reactor 5 along with HF 2.
• the effluent stream 6 exiting the vapor phase reactor 5 is fed to a cooler 7 and then to a first recycle column, such as a distillation column 8.
• the lighter components of the effluent 9 are isolated from the top of the first recycle column and cooled and include one or more of HC1, 1233xf, 244bb (if any), 245cb (if any) and a portion of unreacted HF.
• the remaining compounds are collected at the bottom stream of the column and include a bulk of the unreacted HF, trace amounts of unreacted starting component (if any), residual 1233xf and one or more of the by-product organics discussed herein.
• a "residual" amount of 1233xf refers to less than about 30 wt %, less than about 20%, less than about 15%, or less than about 10% of the total weight of the components in the bottom stream.
• the top stream for example, is first fed into an HCl column (not illustrated) for HCl removal.
• High purity HCl is isolated from the top of the column and fed to an HCl recovery system.
• HCl from the top stream may be absorbed in de-ionized water as concentrated HCl which, optionally, can be recovered for later sale.
• the remaining components including 1233xf, 244bb (if any), 245cb (if any), and HF, exit the bottom of the HCl column and are further processed. In certain embodiments, this bottom stream is then provided to an HF recovery system to recover HF.
• the 1233xf/HF stream is fed to a sulfuric acid extractor or a phase separator for removal of HF from this mixture, i.e. the HF is either dissolved in sulfuric acid or phase separated from the organic mixture.
• a sulfuric acid extractor or a phase separator for removal of HF from this mixture, i.e. the HF is either dissolved in sulfuric acid or phase separated from the organic mixture.
• HF is desorbed from the sulfuric acid/HF mixture by heating and distillation and recycled back to the reactor.
• HF is phase- separated using standard methods, such as those discussed below, and recycled back to the reactor.
• the organic either from the overhead of the sulfuric acid extractor or from the bottom layer of the phase separator is fed to the hydrofluorination reactor of Step (2), discussed below.
• phase separation Components within the bottom stream of the first recycle column 5 are separated, in certain embodiments, by phase separation. More specifically, the mixture is provided to a cooler 10 and then to a phase separator 11 where unreacted HF separates into an HF-rich first or top layer and an organic rich bottom or second layer. Any pressure which maintains the mixture substantially in the liquid phase may be employed. To this end, the pressure and temperature of the mixture may be adjusted such that the mixture remains substantially in the liquid phase.
• the HF-rich layer also includes, as a residual portion, certain of the organics such as, but not limited to 1233xf, 1232xf and 243.
• phase separation may be performed at any combination of temperature and pressure such that two distinct liquid phases are formed in the phase separator. Phase separation may be carried out between about -30°C to 60°C, preferably between about 0°C and 40 °C and more preferably between about 10°C and 30°C.
• the HF rich layer is then isolated, such as by HF phase pump 12, optionally purified 13, and recycled 17 back to the reactor via vaporizer.
• the HF- rich layer is distilled to remove any moisture buildup or is isolated by single stage flash distillation.
• moisture if any is removed by injecting a chemical reagent such as COCl 2 (or SOCl 2 ) into said stream, which reacts with moisture to form C0 2 (or S0 2 ) and HC1.
• the HF- rich layer may be purified to remove the residual organics or may be recycled with the organics.
• the organic-rich layer is also isolated, such as by organic phase pump 14, then further processed to separate and purify the unreacted starting reactants (if any) and recyclable intermediates.
• the organic-rich layer is provided to a high boiler purge system 15, where unreacted starting reagents (if any), residual 1233xf, 1231 isomers, 1232xf, 243 isomers, 242 isomers, etc. are recovered and undesirable by-products, particularly dimers and other impurities, are removed.
• a "residual" amount of HF refers to less than about 15 wt %, less than about 10%, less than about 5%, or less that about 3% of the total weight of the components in the bottom layer.
• the high boiler purge system may be a distillation system operated in batch or continuous mode, preferably batch for operational reasons. Another option is to use a flash or series of flashes. In either case (distillation or flash), the more volatile components are recovered and recycled while the heavier components are removed from the system.
• feed 22 from the organic phase pump 14 is provided to a batch distillation column and heated via steam supply 30.
• the lighter components e.g.
• unreacted starting compounds, 1233xf, 1231 isomers, 1232xf, 243 isomers, 242 isomers may be recycled 16 to the reactor 5.
• the unreacted starting components (if any) and the recyclable intermediates are converted to the desired composition 1233xf and/or its precursors.
• the heavy compounds e.g. dimers, etc.
• the purified 1233xf intermediate stream is converted to 2-chloro-l,l,l,2-tetrafluoropropane (244bb).
• this step may be performed in the liquid phase in a liquid phase reactor, which may be TFE or PFA-lined. Such a process may be performed in a temperature range of about 70-120 °C and about 50-120 psig.
• Any liquid phase fluorination catalyst may be used in the invention.
• a non- exhaustive list include Lewis acids, transition metal halides, transition metal oxides, Group IVb metal halides, a Group Vb metal halides, or combinations thereof.
• Non-exclusive examples of liquid phase fluorination catalysts are an antimony halide, a tin halide, a tantalum halide, a titanium halide, a niobium halide, and molybdenum halide, an iron halide, a fluorinated chrome halide, a fluorinated chrome oxide or combinations thereof.
• liquid phase fluorination catalysts are SbCl 5 , SbCl 3 , SbF 5 , SnCl 4 , TaCl 5 , T1CI4, NbCl 5 , MoCl 6 , FeCl 3 , a fluorinated species of SbCl 5 , a fluorinated species of SbCl 3 , a fluorinated species of SnCl 4 , a fluorinated species of TaCl 5 , a fluorinated species of TiCl 4 , a fluorinated species of NbCls, a fluorinated species of MoCl 6 , a fluorinated species of FeCl 3 , or combinations thereof.
• Antimony pentachloride is most preferred.
• These catalysts can be readily regenerated by any means known in the art if they become deactivated.
• One suitable method of regenerating the catalyst involves flowing a stream of chlorine through the catalyst. For example, from about 0.002 to about 0.2 lb per hour of chlorine can be added to the liquid phase reaction for every pound of liquid phase fluorination catalyst. This may be done, for example, for from about 1 to about 2 hours or continuously at a temperature of from about 65 °C to about 100 °C.
• This second step of the reaction is not necessarily limited to a liquid phase reaction and may also be performed using a vapor phase reaction or a combination of liquid and vapor phases, such as that disclosed in U.S. Published Patent Application No.
• the 1233xf containing feed stream is preheated to a temperature of from about 50 °C to about 400 °C, and is contacted with a catalyst and fluorinating agent.
• Catalysts may include standard vapor phase agents used for such a reaction and fluorinating agents may include those generally known in the art, such as, but not limited to, hydrogen fluoride.
• the 244bb is fed to a second vapor phase reactor (dehydrochlorination reactor) to be dehydrochlorinated to make the desired product 2,3,3,3-tetrafluoroprop-l-ene (1234yf).
• This reactor contains a catalyst that can catalytically dehydrochlorinate HCFC-244bb to make HFO-1234yf.
• the catalysts may be metal halides, halogenated metal oxides, neutral (or zero oxidation state) metal or metal alloy, or activated carbon in bulk or supported form.
• Metal halide or metal oxide catalysts may include, but are not limited to, mono-, bi-, and tri- valent metal halides, oxides and their mixtures/combinations, and more preferably mono-, and bivalent metal halides and their mixtures/combinations.
• Component metals include, but are not limited to, Cr 3+ , Fe 3+ , Mg 2+ , Ca 2+ , Ni 2+ , Zn 2+ , Pd 2+ , Li + , Na + , K + , and Cs + .
• Component halogens include, but are not limited to, F " , CF, Br " , and F.
• Examples of useful mono- or bivalent metal halide include, but are not limited to, LiF, NaF, KF, CsF, MgF 2 , CaF 2 , LiCl, NaCl, KC1, and CsCl.
• Halogenation treatments can include any of those known in the prior art, particularly those that employ HF, F 2 , HC1, Cl 2 , HBr, Br 2 , HI, and I 2 as the halogenation source.
• metals, metal alloys and their mixtures are used.
• Useful metals include, but are not limited to, Pd, Pt, Rh, Fe, Co, Ni, Cu, Mo, Cr, Mn, and combinations of the foregoing as alloys or mixtures.
• the catalyst may be supported or unsupported.
• Useful examples of metal alloys include, but are not limited to, SS 316, Monel 400, Inconel 825, Inconel 600, and Inconel 625. Such catalysts may be provided as discrete supported or unsupported elements and/or as part of the reactor and/or the reactor walls.
• Preferred, but non-limiting, catalysts include activated carbon, stainless steel
• the reaction temperature is preferably about 300-550 °C and the reaction pressure may be between about 0-150 psig.
• the reactor effluent may be fed to a caustic scrubber or to a distillation column to remove the by-product of HC1 to produce an acid-free organic product which, optionally, may undergo further purification using one or any combination of purification techniques that are known in the art.
• the pilot demonstration unit is composed of feed delivery system, vaporizer, reactor/heating system, distillation column, phase separator, recycle system, caustic solution scrubber, and product (1233xf) collection system.
• organic feed containing 10 weight % 1233xf and 90 weight % 1230xa was passed through a drying column and combined with HF feed before entering vaporizer.
• the vaporized vapor mixture was then introduced into reactor, which was charged with 6.5 L of fluorinated chromium oxide catalyst.
• the reaction temperature and pressure were 200°C and 70 psig, respectively.
• the reactor effluent was directed to a cooler operated at ⁇ 30 °C before entering a distillation column operated at 60 psig.
• PCC Product Collection Cylinder
• the effluent from the bottom of the distillation column (mainly HF, unreacted 1230xa (if any), 1232xf and other underfluorinated compounds and various by-products) are sent through a heat exchanger (cooler) and then to a phase separator (PS), which is a 20-gallon vessel equipped with a pressure transducer, thermocouple, sight tube, rupture disk, and dip tube, and was operated at about 25°C and about 25 psig in this example.
• the length of the dip tube is 50% of the length of the PS.
• HF recycle was initiated once enough material was accumulated in the PS.
• Samples were periodically taken from the top and bottom of PS and were analyzed. As shown in Table 1, the top layer was HF rich while the bottom one was organic rich. As shown in Table 2, the organics in HF-rich layer were mainly composed of lighter components, such as 1233xf, 1232xf, etc., while those in organic-rich layer those lighter components were less than 50%.
• Comparative Example 2 [0050] The same pilot demonstration unit is used as in Example 1. Besides the HF recycle stream, organic recycle is also initiated by pumping the liquid of organic-rich layer through the bottom of phase separator. The analysis of reactor effluent shows significant amount of 1230xa is detected after 100 h on stream, indicating deactivation occurs during this period of time.

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